POV-Ray : Newsgroups : povray.general : premultiplied alpha Server Time
6 Aug 2024 21:34:49 EDT (-0400)
  premultiplied alpha (Message 1 to 4 of 4)  
From: joshua kaelin
Subject: premultiplied alpha
Date: 28 Dec 2001 20:40:26
Message: <3c2d1f0a@news.povray.org>
are there any plans to support straight alpha channel information as the PNG
format requires or will pov-ray remain in partial complience with the PNG
standard?  is there any known way to enable this functionality in v3.1 or
v3.5?

we are trying to render objects with transparency and composite them in a
game using the alpha channel, but the current output produces inadequate
results; the object displays fringes of the render background color.

- joshua kaelin


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From: Rune
Subject: Re: premultiplied alpha
Date: 28 Dec 2001 22:09:29
Message: <3c2d33e9@news.povray.org>
"joshua kaelin" wrote:
> is there any known way to enable this functionality
> in v3.1 or v3.5?

Have you actually tried POV-Ray 3.5 (beta)? It works fine there.

Rune
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From: Mahalis
Subject: Re: premultiplied alpha
Date: 29 Dec 2001 07:53:57
Message: <3c2dbce5@news.povray.org>
+UA in 3.5 (actually, as you probably know, it would be +FN +UA).
"joshua kaelin" <web### [at] planetflux-spamfreecom> wrote in message
news:3c2d1f0a@news.povray.org...
> are there any plans to support straight alpha channel information as the
PNG
> format requires or will pov-ray remain in partial complience with the PNG
> standard?  is there any known way to enable this functionality in v3.1 or
> v3.5?
>
> we are trying to render objects with transparency and composite them in a
> game using the alpha channel, but the current output produces inadequate
> results; the object displays fringes of the render background color.
>
> - joshua kaelin
>
>


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From: Warp
Subject: Re: premultiplied alpha
Date: 29 Dec 2001 16:57:25
Message: <3c2e3c45@news.povray.org>
joshua kaelin <web### [at] planetflux-spamfreecom> wrote:
: are there any plans

  Nope, there aren't any plans because it has already been fixed long ago
in the 3.5 version.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -


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